Heat Exchanger for Common Use for Boiler and Hot Water Supply

ABSTRACT

A heat exchanger for common use for both a boiler and a hot water supply is provided, which includes a plurality of inner plate members ( 110 ) having inner plate member grooves formed on either side of the upper end thereof, and a burner provided on the bottom surface thereof, to thereby perform a combustion chamber function; combustion heat fin tubes ( 120 ) formed of a number of heat exchange tubes on the outer circumferential surface of which transfer heat fins are formed; an insulation member ( 130 ) which is installed in an identical area along the inner walls of the inner plate members; and an independent heat exchanger body which is connected with the combustion heat fin tubes. Thus, a heat exchanger for a condensing or noncondensing gas boiler can be manufactured at low cost, through the common heat exchanger Further, two kinds of heat exchangers can be manufactured through a single common heat exchanger to thereby make an additional process unnecessary.

TECHNICAL FIELD

The present invention relates to a heat exchanger for common use for aboiler and a hot water supply, and more particularly to, a heatexchanger for common use for a boiler and a hot water supply in which acombustion chamber and a common heat exchanger can be used in commonwhen manufacturing a non-condensing, semi-condensing and condensingboiler, to thereby make it possible to manufacture the non-condensing,semi-condensing and condensing boiler.

BACKGROUND ART

A boiler for use in general homes and buildings is used for heatingrooms and supplying hot water, which is divided into a fuel oil boilerand a fuel gas boiler, according to a type of fuel used.

In the case of a gas fuel boiler, liquified petroleum gas (LPG) has beenbeing used, but liquified natural gas (LNG) is being used since LNGcontains few sulfuric component in comparison with LPG, to thus minimizean air pollution.

In addition, a gas boiler can be divided into a variety of typesaccording to a control method or a sealing state thereof. Further, a gasboiler can be classified into a condensing gas boiler and anon-condensing gas boiler according to a method of re-collecting heatsources heating water.

As shown in FIGS. 1 and 2, a heat exchanger for use in a condensingboiler includes a combustion heat exchanger 29 which heats waterdirectly using heat from a burner 10, and a latent heat exchanger 28which heats water indirectly using latent heat of an exhaust gas passingthrough the combustion heat exchanger 29.

In the case of the heat exchanger of the condensing boiler, waterflowing through combustion heat fin tubes 29′ is primarily heated by acombustion function of a burner 10, and an exhaust gas passing throughan exhaust gas inlet 31 secondarily heats water in latent fin tubes 28′.

Here, a condensed water basin 32 which externally guides condensed waterdue to an exhaust gas is provided between the combustion heat exchanger29 and the latent heat exchanger 28.

Further, a guide plate 33 slants at the same angle as the condensedwater basin 32. An exhaust gas discharge portion 36 is formed inopposition to the exhaust gas inlet 31.

Thus, the exhaust gas passing through the combustion heat exchanger 29flows in via one side of the latent heat exchanger 28 by the condensedwater basin 32, passes through latent fin tubes 28′, and is dischargedvia an exhaust gas outlet 37 in an exhaust gas discharge portion 36.Accordingly, heat can be transferred toward the latent heat exchanger 28for a sufficient time.

Meanwhile, as shown in FIGS. 3 and 4, in the case of a heat exchangerfor use in a non-condensing boiler which is referred to as anon-condensing heat exchanger, a heat exchanger 30 is directly heated bycombustion of a burner 10, and an exhaust gas is discharged via anexhaust gas outlet 37.

DISCLOSURE OF INVENTION

Technical Problem

Here, the non-condensing heat exchanger 30 is generally made of a coppermaterial whose heat transfer rate is excellent. Since a high heatefficiency is pursued due to an energy policy and a control technologyis developed, the non-condensing heat exchanger is designed to suppresscondensation at maximum. However, a condensation phenomenon cannot beprevented from occurring partially or temporarily, which causes the heatexchanger to be corroded.

As described above, the heat exchanger of the condensing boiler shown inFIGS. 1 and 2 differs in its construction from that of thenon-condensing boiler shown in FIGS. 3 and 4, due to respectivelydifferent heat absorption methods.

Thus, since respectively different structural heat exchangers should bemanufactured in order to make a condensing boiler and a non-condensingboiler, it is difficult to share components of the heat exchangers. As aresult, the material cost for the heat exchanger increases and thenumber of processes thereof increases as well.

Technical Solution

To solve the above problems, it is an object of the present invention toprovide a heat exchanger for common use for a boiler and a hot watersupply which enables a manufacturer to selectively manufacture acondensing boiler, a semi-condensing boiler and a non-condensing boilerat low cost, to thus save a development period, a manufacturing cost,and a management cost after mass-production, relatively in comparisonwith those of a conventional heat exchanger, in which a latent heatexchanger or a non-condensing heat exchanger (called an auxiliary heatexchanger) is combined on the upper end of the common heat exchangerwhich can be commonly used for manufacturing the condensing boiler, thesemi-condensing boiler, and the non-condensing boiler.

It is another object of the present invention to provide a heatexchanger for common use for a boiler and a hot water supply which ismade of a corrosion-resistant material and a hybrid metalcorrosion-preventive structure and includes a condensed water basin asnecessary.

It is still another object of the present invention to provide a heatexchanger for common use for a boiler and a hot water supply which has astructure of making an exhaust gas smoothly flow in which a latent heatexchanger is combined on the upper portion of the common heat exchangerwhen a condensing boiler is manufactured using the common heat exchangerand a duct is installed between the common heat exchanger and thecondensing boiler, and which has a structure of regulating a flow of gasin which a non-condensing heat exchanger and a latent heat exchangerwhich are combined on the upper portion of the common heat exchangerhave an identical same gas flow direction each other.

Advantageous Effects

As described above, a heat exchanger for a condensing and non-condensinggas boiler can be manufactured with a common heat exchanger according tothe present invention. Accordingly, the heat exchanger for a gas boilercan be manufactured at low cost. Also, since two kinds of heatexchangers can be manufactured with a common heat exchanger, anadditional process is not necessary.

In particular, since it is possible to share the common heat exchangeras a common component, condensing, semi-condensing, and non-condensinggas boilers can be selectively manufactured. As a result, a developmentperiod of a product, a manufacturing cost therefor, and a managementcost therefor after mass-production can be saved relatively incomparison with those of a conventional heat exchanger.

In addition, a non-condensing boiler adopting a common heat exchangeraccording to the present invention has a high efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects and advantages of the present invention willbecome more apparent by describing the preferred embodiments thereof indetail with reference to the accompanying drawings in which:

FIGS. 1 and 2 are a perspective view and a cross-sectional view showinga conventional condensing heat exchanger, respectively;

FIGS. 3 and 4 are a perspective view and a cross-sectional view showinga conventional non-condensing heat exchanger, respectively;

FIG. 5 is a perspective view showing a common heat exchanger accordingto the present invention;

FIG. 6 is an exploded perspective view showing a common heat exchangeraccording to the present invention;

FIG. 7 is an exploded perspective view showing a common heat exchangerof FIG. 6 which additionally has an outer cover according to anotherembodiment of the present invention;

FIG. 8 is a perspective view showing an example of a condensing heatexchanger to which the common heat exchanger shown in FIG. 7 accordingto the present invention is applied;

FIG. 9 is an exploded perspective view showing the condensing heatexchanger shown in FIG. 8 according to the present invention;

FIG. 10 is an exploded perspective view showing only a latent heatexchanger separated from the condensing heat exchanger shown in FIG. 8according to the present invention;

FIG. 11 is an exploded perspective view showing the latent heatexchanger shown in FIG. 10 according to the present invention;

FIG. 12 is a cross-sectional view showing the condensing heat exchangershown in FIG. 8 according to the present invention;

FIG. 13 is a perspective view showing an example of a non-condensingheat exchanger to which the common heat exchanger shown in FIG. 7according to the present invention is applied;

FIG. 14 is an exploded perspective view showing the non-condensing heatexchanger shown in FIG. 13 according to the present invention; and

FIG. 15 is a cross-sectional view showing the non-condensing heatexchanger shown in FIG. 13 according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

To accomplish the above object of the present invention, according tothe present invention, there is provided a heat exchanger for common usefor a boiler and a hot water supply, the common heat exchangercomprising: a plurality of inner plate members having inner plate membergrooves formed on either side of the upper end thereof, and a burnerprovided on the bottom surface thereof, to thereby perform a combustionchamber function; combustion heat fin tubes formed of a number of heatexchange tubes on the outer circumferential surface of which transferheat fins are formed so that a heat exchange is performed by hot waterflows in the transfer heat fins in which the combustion heat fin tubesare mounted into the inner plate member grooves provided in the innerplate member; a heat insulation member which is installed in anidentical area along the inner walls of the inner plate members; and anindependent heat exchanger body which is connected with the combustionheat fin tubes so that hot water can flow and is formed of a pluralityof water tubes wound on the outer circumferential surfaces of the innerplate members.

Preferably, an outer cover is further installed at the outermost portionof the heat exchanger body so as to surround the plurality of watertubes wound on the outer circumferential surfaces of the inner platemembers.

In addition, a structure of a condensing boiler is formed in the casethat a latent heat exchanger having latent fin tubes absorbing latentheat in the latent heat exchanger body is independently combined on theupper portion of the heat exchanger body.

Here, it is preferable that a duct is formed between the heat exchangerbody and the latent heat exchanger to thus make an exhaust gas smoothlyflow.

Meanwhile, a structure of a non-condensing boiler having a relativelyhigh output capacity is formed in the case that an auxiliary heatexchanger absorbing only combustion heat is independently combined onthe upper portion of the heat exchanger body.

Mode for the Invention

Hereinbelow, a common heat exchanger for common use for a non-condensingboiler and a condensing boiler according to the present invention willbe in detail described with reference to the accompanying drawings.

FIG. 5 is a perspective view showing a common heat exchanger accordingto the present invention. FIG. 6 is an exploded perspective view showinga common heat exchanger according to the present invention. FIG. 7 is anexploded perspective view showing a common heat exchanger of FIG. 6which additionally has an outer cover according to another embodiment ofthe present invention.

As shown in FIGS. 5 and 6, a common heat exchanger 1 according to thepresent invention largely includes a plurality of inner plate members110, combustion heat fin tubes 120, a heat insulation member 130, andwater tubes 140, all of which are formed as an independent heatexchanger body 100.

Here, the inner plate members 110 perform a combustion chamber functionas in a conventional heat exchanger.

That is, the inner plate members 110 has a rectangular box structurehaving a burner (not shown) which burns air and gas inhaled by operationof a blower (not shown) provided on the bottom surface thereof, and aplurality of inner plate member grooves 111 into which the plurality ofcombustion heat fin tubes 120 are assembled on both sides of the upperend thereof, to thereby perform a combustion chamber function in aboiler.

Here, windows 112 can be provided on the inner plate members 110 so thata user can monitor a burning flame from the outside of the heatexchanger.

The combustion heat fin tubes 120 are formed of a number of heatexchange tubes on the outer circumferential surface of which transferheat fins are formed so that a heat exchange is performed by hot waterflows in the transfer heat fins. It is preferable that the combustionheat fin tubes 120 are made of a copper material whose heat transferrate is excellent as in a conventional heat exchanger in a conventionalgas boiler, and it is manufactured to have a structure of contactingcombustion heat due to combustion of the burner as a number of times aspossible.

One end of the combustion heat fin tubes 120 is connected with a hotwater supply tube (not shown) of a gas boiler and the other end thereofis connected with a fin tube of a latent heat exchanger 53 or anon-condensing heat exchanger to be described later.

The combustion heat fin tubes 120 are connected in zigzag form viaU-shaped tubes 121. Accordingly, the plurality of the combustion heatfin tubes 120 form a single long tube so that water flowing therein isheat-exchanged with the combustion heat, to thus perform a combustionchamber function.

Here, the U-shaped tubes 121 are made of the same material as that ofthe combustion heat fin tubes 120 in order to prevent a corrosionoccurring in hybrid metal between the U-shaped tubes 121 and thecombustion heat fin tubes 120.

Thus, the hot water which flows in via one end of the combustion heatfin tubes 120 from the hot water supply tube flows along the respectivecombustion heat fin tubes 120 via the U-shaped tubes 121 so as to beheat-exchanged with the combustion heat from the burner for a long time.

As shown in FIG. 6, since the inner plate members 110 perform acombustion chamber function, it is preferable that a heat insulationmember 130 is installed in the inner plate members 110 in order toisolate combustion heat from being discharged out via the inner platemembers 110 in the case that combustion occurs in the inside of theinner plate members 110.

Here, since it is preferable that the insulation material 130 isprovided over the whole inner walls of the inner plate members 110, theinsulation member 130 is installed in the inner walls of the inner platemembers 110 in the same area and substantially same structure as thoseof the inner plate members 110.

In addition, a plurality of water tubes 140 connected with thecombustion heat fin tubes 120 are wound on the outer circumferentialsurfaces of the inner plate members 110, in order to absorb thecombustion heat discharged from the inner plate members 110 as much aspossible, to thus enhance a heat efficiency.

As shown in FIG. 7, according to another aspect of the presentinvention, an outer cover 150 is further installed at the outermostportion of the heat exchanger body so as to surround the plurality ofwater tubes 140 wound on the outer circumferential surfaces of the innerplate members 110.

It is preferable that the outer cover 150 has a structure of the sameshape as that of the inner plate members 110, like the insulation member130.

In particular, the outer cover 150 can absorb heat discharged from thecombustion chamber via the inner plate members 110 to a degree using amaterial of metal, and isolate the outer portions of the inner platemembers 110 from users to thereby protect them safely from contactingthe hot portions. Further, the outer cover 150 does not expose the watertubes 140 wound on the outer walls of the inner plate members 110, tothereby play a role of making an external countenance look good.

That is, although heat radiated from the inner plate members 110 via theinsulation member 130 has been prevented at maximum, high-temperaturecombustion heat can be discharged out via the inner plate members 110 toa degree. Here, the water tubes 140 wound on the outer walls of theinner plate members 110 can absorb the high-temperature combustion heatto thus primarily heat-exchange with the combustion heat, andsimultaneously isolate heat discharged from the outer cover 150 tofurther prevent a thermal loss.

In particular, since the outer cover 150 absorbs a relatively smallamount of heat, the surface temperature of the outer cover 150 isremarkably lowered. Although users get in touch with the outer cover150, a danger of a burn can be reduced.

In the case that the common heat exchanger 1 is manufactured, a burneris provided on the bottom surface of the inner plate members 110, andthen the combustion heat fin tubes 120 are assembled with a plurality ofinner plate member grooves 111 provided on either side of the upper endof the inner plate members 110. Then, the plurality of combustion heatfin tubes 120 are connected via U-shaped tubes 121 excluding one end andthe other end of the plurality of the combustion heat fin tubes 120.

At the state where the common heat exchanger 1 according to the presentinvention has been provided as described above, a condensing gas boileror non-condensing boiler can be manufactured as desired.

Hereinbelow, a condensing boiler to which the common heat exchanger 1according to the present invention is applied will be described withreference to FIGS. 8 through 12.

FIG. 8 is a perspective view showing an example of a condensing heatexchanger to which the common heat exchanger shown in FIG. 7 accordingto the present invention is applied. FIG. 9 is an exploded perspectiveview showing the condensing heat exchanger shown in FIG. 8 according tothe present invention. FIG. 10 is an exploded perspective view showingonly a latent heat exchanger separated from the condensing heatexchanger shown in FIG. 8 according to the present invention. FIG. 11 isan exploded perspective view showing the latent heat exchanger shown inFIG. 10 according to the present invention. FIG. 12 is a cross-sectionalview showing the condensing heat exchanger shown in FIG. 8 according tothe present invention.

As shown in FIGS. 8 through 12, a latent heat exchanger 2 which canabsorb latent heat from an exhaust gas is independently combined on theupper portion of a common heat exchanger 1 according to the presentinvention, to thus form a condensing heat exchanger.

Here, a separate duct 300 is formed between the common heat exchanger 1and the latent heat exchanger 2 to thus make an exhaust gas smoothlyflow in the case that the latent heat exchanger 2 is combined with thecommon heat exchanger 1.

That is, the duct 300 is combined on the upper portion of the combustionheat fin tubes 120 in the common heat exchanger 1.

Here, as shown in more detail in FIG. 11, the duct 300 includes anexhaust gas outlet 303 through which an exhaust gas having passedthrough the combustion heat fin tubes 120 is discharged and which isprovided on part of the upper surface 301 thereof, and an inclinedsurface 302 provided in opposition to the exhaust gas outlet 303.

The latent heat exchanger body 200 of the latent heat exchanger 2 iscombined on the duct 300.

The bottom surface of the latent heat exchanger body 200 has a structurecorresponding to the upper surface 301 and the inclined surface 302 ofthe duct 300, and has an exhaust gas inlet 201 in correspondence to thesame position as that of the exhaust gas outlet 303.

A condensed water outlet 202 through which condensed water formed due tothe exhaust gas is discharged is provided on the lowermost end of thebottom surface of the latent heat exchanger body 200.

A plurality of latent heat fin tubes 210 through which hot water flowsare provided in the latent heat exchanger body 200.

The latent heat fin tubes 210 perform a heat exchange like thecombustion heat fin tubes 120 in the common heat exchanger 1, and arepreferably made of a corrosion-resistant material such as aluminum andstainless steel, to thereby prevent corrosion due to condensation. Morepreferably, the latent heat fin tubes 210 are made of a plurality oftubes each having a double structure, in which a copper tube is insertedinto the inside of an aluminum tube whose cost is lower than that of thecooper tube, differently from the combustion heat fin tubes 120 whichare made of copper tubes.

Here, the latent heat fin tubes 210 are fitted with separate lateralplates 220 which cover the lateral surfaces of the latent heat exchangerbody 200, and are connected with each other by U-shaped tubes 221, tothereby form a single tube through which hot water can flow.

The latent heat fin tubes 210 are connected with the combustion heat fintubes 120 and a hot water inlet tube (not shown) both which arepositioned below the latent heat fin tubes 210, through connection tubes222 and 223.

As a result, as shown in FIG. 11, hot water having flown in from theconnection tube 223 through the unshown hot water inlet tube flowsthrough the plurality of latent heat fin tubes 210 for a long time, andthen flows out to the combustion heat fin tubes 120 via the otherconnection tube 222, to accordingly perform a heat exchange through thehigh-temperature exhaust gas and the combustion heat.

Meanwhile, an exhaust gas tower 230 forming the latent heat exchanger 1generally is provided on the upper ends of the latent heat exchangerbody 200 and the lateral plates 220.

The exhaust gas tower 230 includes an exhaust gas outlet 231 fordischarging an exhaust gas on the upper end thereof.

A guide plate 240 which guides a flow of the exhaust gas so that anexhaust gas can flow over the whole of the plurality of latent heat fintubes 210 and firmly fixes the latent heat fin tubes 210 is providedbetween the latent heat fin tubes 210 and the exhaust gas tower 230.

It is preferable that the guide plate 240 is formed to have the sameinclination as those of the latent heat fin tubes 210 which areslantedly installed in the latent heat exchanger body 200.

As shown in FIG. 9, a packing 170 made of rubber is provided between theinner plate members 110 with which the combustion heat fin tubes 120 arefitted and the duct 300, to thereby enable the upper sides of the innerplate members 110 and the lower side of the duct 300 to be connectedwith each other stably while maintaining a sealing capability.

In the case of the condensing heat exchanger to which the common heatexchanger according to the present invention is applied as describedabove, water in the combustion heat fin tubes 120 is primarily heated bythe combustion heat of the burner 10, and then the latent heat fin tubes210 are heated by gas having passed through the duct 300, as shown inFIG. 12, to thereby provide a heat exchanger for a condensing gasboiler.

Hereinbelow, a non-condensing gas boiler to which the common heatexchanger 1 according to the present invention is applied will bedescribed with reference to FIGS. 13 through 15.

FIG. 13 is a perspective view showing an example of a non-condensingheat exchanger to which the common heat exchanger shown in FIG. 7according to the present invention is applied. FIG. 14 is an explodedperspective view showing the non-condensing heat exchanger shown in FIG.13 according to the present invention. FIG. 15 is a cross-sectional viewshowing the non-condensing heat exchanger shown in FIG. 13 according tothe present invention.

A non-condensing boiler shown in FIG. 13 has an auxiliary heat exchangerhaving a relatively small capacity installed in a common heat exchangeraccording to the present invention. The auxiliary heat exchanger whichabsorbs only combustion heat can suppl ement an output capacity which isinsufficient with only a common heat exchanger.

That is, as shown in FIGS. 13 to 15, an auxiliary heat exchanger 3 whichabsorbs only combustion heat is mounted on the common heat exchanger 1according to the present invention, to thereby form a non-condensingheat exchanger. The non-condensing heat exchanger has a structure inwhich a cover-shaped exhaust gas duct 160 is installed on the innerplate members 110 in the common heat exchanger 1, and auxiliarycombustion heat fin tubes 310 are installed between the exhaust gas duct160 and the combustion heat fin tubes 120 on the upper end surfaces ofthe inner plate members 110.

An exhaust gas outlet 161 is provided in the exhaust gas duct 160 formedon the upper portion of the auxiliary heat exchanger 3.

That is, as shown in FIG. 14, a plurality of inner plate member grooves111 are provided on both sides of the upper ends of inner plate members110. A plurality of combustion heat fin tubes 120 which heat waterthrough heat exchanging with combustion heat are mounted into the innerplate member grooves 111 which are then tightly assembled with aseparate lateral plate 180.

Here, the combustion heat fin tubes 120 are preferably made of a formrolling fin structure where fins are form rolled on a tube made ofcopper, respectively.

Of course, the fins on the combustion heat fin tubes 120 can be combinedon the outer circumferential surface of the tubes through a well-knownbrazing weld.

The auxiliary combustion heat fin tubes 310 installed on the upperportion of the combustion heat fin tubes 120 are mounted between theupper end of the lateral plate 180 and exhaust gas duct grooves 162 inthe exhaust gas duct 160.

Here, the auxiliary combustion heat fin tubes 310 are preferably made ofa form rolling fin structure where fins are form rolled on a tube madeof aluminum which is cheap and has a good corrosion-resistant capabilityin comparison with copper, respectively.

Of course, in the case of the auxiliary combustion heat fin tubes 310,the fins provided on the outer circumferential surfaces of the tubes canbe also formed of a well-known general fin structure, not a form rollingfin structure.

Since an auxiliary heat exchange is performed in the auxiliarycombustion heat fin tubes 310, they do not need to be made of fin tubesof copper which is expensive.

That is, the combustion heat fin tubes 120 whose exhaust gas temperatureis high are made of copper in order to prevent damage due to hightemperature, while the auxiliary combustion heat fin tubes 310 whoseexhaust gas temperature is relatively low are made of aluminum. In thismanner, the heat exchanger according to the present invention can bemanufactured at low cost.

The auxiliary combustion heat fin tubes 310 are connected with eachother by means of U-shaped tubes 311, respectively, according to aconventional method.

The auxiliary combustion heat fin tubes 310 and the combustion heat fintubes 120 are connected with each other via connection tubes 312,respectively.

In particular, the lateral plate 180 combined with both sides of theupper portion of the inner plate members 110 is separately manufacturedfrom the inner plate members 110 and plays a role of fixing andsupporting the combustion heat fin tubes 120 and the auxiliarycombustion heat fin tubes 310 together with the inner plate members 110and the exhaust gas duct 160.

As described above, since the combustion heat fin tubes 120 and theauxiliary combustion heat fin tubes 310 are assembled with each otherbetween the common heat exchanger 1 and the auxiliary heat exchanger 3,by means of the lateral plate 180, the number of connection portions isreduced to thereby reliably maintain air-tightness of the heatexchanger.

In addition, as shown in FIG. 14, a packing 170 is provided between theinner plate members 110 where the combustion heat fin tubes 120 arefitted and the auxiliary heat exchanger 3. Accordingly, the upper sidesof the inner plate members 110 and the lower sides of the auxiliary heatexchanger 3 can be stably combined with each other while maintainingair-tightness.

Here, the number of the auxiliary combustion heat fin tubes 310 isgenerally smaller than that of the combustion heat fin tubes 120.

As shown in FIGS. 13 through 15, the exhaust gas duct 160 has astructure that the volume of the duct is reduced upwards. As a result,the number of the auxiliary combustion heat fin tubes 310 can be reducedand simultaneously a flow of the exhaust gas can be stably guided in thedirection of the exhaust gas outlet 161.

An assembly process and combustion process of the non-condensing heatexchanger according to the present invention having the above-describedstructure will be described below in brief.

First, the inner plate members 110, the exhaust gas duct 160, thelateral plate 180, the combustion heat fin tubes 120, and the auxiliarycombustion heat fin tubes 310 are sequentially combined one afteranother and then the auxiliary combustion heat fin tubes 310 and thecombustion heat fin tubes 120 are connected with each other via theconnection tubes 312, respectively. Accordingly, the non-condensing heatexchanger can be simply assembled.

As shown in FIG. 15, the water which is primarily heated by thecombustion heat fin tubes 120 flows toward the auxiliary combustion heatfin tubes 310 via the connection tubes 312, and then is secondarilyheated by the exhaust gas.

As described above, in the case of the heat exchanger of thenon-condensing gas boiler, the water in the lower-side combustion heatfin tubes 120 is heated by combustion heat of the burner 10 via the heatexchanger to which the common heat exchanger in the gas boiler accordingto the present invention is applied, and then the water in theupper-side auxiliary combustion heat fin tubes 310 is heated.

In particular, the combustion heat fin tubes 120 play a role of a mainheat exchanger, and the auxiliary combustion heat fin tubes 310 play arole of an auxiliary heat exchanger. As a result, the non-condensing gasboiler absorbs only combustion heat in the combustion chamber in orderto perform heat exchange.

Meanwhile, the common heat exchanger of the gas boiler according to thepresent invention can be applied to a downstream combustion gas boilerhaving a burner which is provided in the upper portion thereof.

In addition, the common heat exchanger according to the presentinvention can be applied to a general gas boiler in which a gas boilerand a conventional heat exchanger are integrated. That is, theintegrated heat exchanger is divided into several heat exchangers andthen part of the divided heat exchangers are made of conventional copperheat exchangers and the rest of the divided heat exchangers are made ofcorrosion-resistant heat exchangers, in which condensed water basin isinstalled.

Also, a heat exchanger of a form rolling fin structure according to thepresent invention can be made by brazing fins on a copper tube, a doubletube of a copper tube and an aluminum tube, or a stainless steel tube.Here, it is apparent to one who has an ordinary skill in the art that aheat exchanger structure can be easily varied and modified.

1. A heat exchanger for common use for a boiler and a hot water supply,the common heat exchanger comprising: a plurality of inner plate membershaving inner plate member grooves formed on either side of the upper endthereof, and a burner provided on the bottom surface thereof, to therebyperform a combustion chamber function; combustion heat fin tubes formedof a number of heat exchange tubes on the outer circumferential surfaceof which transfer heat fins are formed so that a heat exchange isperformed by hot water flows in the transfer heat fins in which thecombustion heat fin tubes are mounted into the inner plate membergrooves provided in the inner plate members; an insulation member whichis installed in an identical area along the inner walls of the innerplate members; and an independent heat exchanger body which is connectedwith the combustion heat fin tubes so that hot water can flow and isformed of a plurality of water tubes wound on the outer circumferentialsurfaces of the inner plate members.
 2. The common heat exchangeraccording to claim 1, further comprising an outer cover installed at theoutermost portion of the heat exchanger body so as to surround theplurality of water tubes wound on the outer circumferential surfaces ofthe inner plate members.
 3. The common heat exchanger according to claim1 or 2, wherein a structure of a condensing boiler is formed in the casethat a latent heat exchanger having latent fin tubes absorbing latentheat in the latent heat exchanger body is independently combined on theupper portion of the heat exchanger body.
 4. The common heat exchangeraccording to claim 3, wherein a duct is formed between the heatexchanger body and the latent heat exchanger to thus make an exhaust gassmoothly flow.
 5. The common heat exchanger according to claim 1 or 2,wherein a structure of a non-condensing boiler having a relatively highoutput capacity is formed in the case that an auxiliary heat exchangerabsorbing only combustion heat is independently combined on the upperportion of the heat exchanger body.